Tension mechanism



May l5, 1928.

1,669,554 J. DERRY TENSION MECHANISM Filed Feb. 26. 192'? 2 Sheets-Sheet 1 INVENTEIR= m hy Ig y-L,

ATTURNEY5- May 15, 1928.

J. DERRY TENSION MECHANISM Filed Feb. 26. 192-7 2 Sheets-Sheet 2 Patented May 15, 1923.

UNITED' SiT ATE-S PATENT o FIcE.

JASPER nanny; or Maureen, Massacrrusnrrs, nssreivon To ANDREW 'rnnxnnsnu,

. or NEWTON, MASSACHUSETTS. v I

TENSION MECHANISM.

Application flied February 26, 1927. Serial no. 171,348.

This invention relates to tensioningde-- vices .for use on wrapping machines, especially, although not exclusively, wrapping machines wherein a rollof wrapping ma terial is rotatably mounted upon a shuttle which, in turn, is adapted to rotate around the article being wrapped, such as a tire.

The .invention contemplates the provision of an improved tensioning device adapted to exert a braking action preventing the free rotation of the roll of wrapping material by a brake mechanism mounted for engagement with the rotatable reel or spool carrying the roll of wrapping material, said tensioning device being of the type wherein thebraking force is automatically proportioned to the diameter of theroll, being of simple but effective construction, and being so disposed upon the shuttle as to minimize the action of centrifugalforce due to the rotation of the shuttle when employed in connection with shuttles of the rotary type. The foregoing and other objects of the invention will be more clearly understood from the following description in conjunction with the accompanying drawmgs, in

which,

Fig. 1 is an elevational view of a wrapping machine in which the invention is embodied; I

Fig. 2 is a detail elevational view of the tension device constructed in accordance with the principles of the invention; and

Fig. 3 is a detail plan viewof the same.

The machine shown in the drawings for the purpose of illustration comprises a base 10 carrying uprights 11 in which rollers12 are suitably mounted for rotation and are arranged to be driven' by any suitable driving mechanism, generally indicated at 33, to rotate the article or work W which is to be wrapped. The article is appropriately held in contact with the rollers 12 by a roller 13 rotatably mounted upon a weighted arm14 pivotally secured to a post 15 mounted upon the base 10. A shuttle 16 provided with a tongue 17 is held for rotation between a plurality of rollers 18, having grooves 19, rotatably mounted upon the yoke 21 pivotally mounted to turn about a shaft 22 in a support 23 extending upwardly from the base 10. The yoke 21 is adjustably secured in a post 25 on the base 10 by a clamp 26. The shuttle 16 may be rotated around the article to be wrapped in any appropriate manner such-as by a friction disc '31 secured to'the shaft 22 and engaging a friction roller 32 upon the armature shaft of a motor 33. A

spool or reel 34 is rotatably mounted upon a stud 58 fixed to the shuttle to support a roll 35of wrapping material, such as paper.

The invention particularly contemplates the provision of an improved mechanism of simple construction adapted to apply a substantially constant tensionto the strip S of wrapping material as it is drawn from the roll. This device, as illustrated, is mounted upon the shuttle 16 and comprises a supporting plate 36 secured to the shuttle 16by. screws passing through the "holes 37 and 38 in the plate. A lever 39 is pivotally mounted to engage the outer surface of the roll of cordance with the preferred construction,

the lever-'39 is'provided with a counterbalance arm 41 which is arranged to minimize vthe action of centrifugal force dueto rotation of the shuttle. 'A brake member 43' is pivotally mounted at one end upon a stud 44 on the plate 36 and pivotally connected at wrapping material 35 and to turn' freely upon a stud 40 upon the-plate 36. In ,ac-

on the rod 45 so as to engage at one end a collar 54 loosely mounted upon'the rod 45 and adapted to abut the lug 50. The other end of the spring 53 is held by and adjustably positioned relative to the rod 45 by nuts 55' engaging a threaded portion 56 onj-f the rod 45 so that the compression ofthe spring may be adjusted to force'the brake .member 43 with a desired pressure against a drum 57 integral with or otherwise rigidly secured upon the spool 34 which grips the roll 35 of wrapping material. By such provisions the brake mechanism is arranged I upon the shuttle so'thatthe action of cen' trifugal force. thereon will be exerted in a direction substantially tangential to the shaft upon which the roll of wrapping paper is mounted.

In operation the shuttle 16 andthe work W are rotated at suitable desired relative rates by the driving mechanisms actuated by the motor 30, whereby the wrapping material is drawn from the roll 35 and is caused shuttle for engagement with said spool and to bewoundfspirally upon the Work W. The arranged so that the action of centrifugal desired braking action preventing the free forcehas substantially no effect on the op- 6 rotation of the roll is obtained by adjusteration of the brakemeehanism and means ing-tl1ecompression of the spring 53 so it automaticallycontrollingthebrakingactioli will force the brake member 43 against the in response to variations in thediameter of drum 57 with the desired pressure It p the roll. 7

be noted that the braking action as effected 4. Ina' Wrapping machine having means by the spring 53 will vary depending upon for supporting anarticle to be Wrapped, the

the position of the lever 39 upon the outer combination'of a shuttle rotatable around surface ofthe roll 85, that is,' as the diameter the article, a spool rotatably mountedon the of the roll 35 becomes reduced in size, the shuttle forfisuppprtinga roll, of wrapping lever 39 Will more towards the center there- ,material, a brake inember; pivotally con,- 7

of thereby reducing the compression upon nected \vithutheshuttleutoextenclina edirec- .t the spring 53 andjthe force which isexerted tion: substantially radial thereto'and engage y the ake mem r 3- By p o i ing t e e pool whereby centrituga i or due-t lever 38 Within counterbalance.arm the ac the rotation of the shuttle hassubstantiallytion of centrlfugal force thereon will be no effect on the operationuofthe brake ne 'nminimized by preventing change in its poher, a lever pivotally arranged to ,engageithe sition tending to vary theaction of the brak outersurface of -theroll, and means for eon- -e I ing mechanism, So also it ill be noted that trolling the actionv of the brake by the posi; i by positioning the brake 43 so as toezttend tion of the lever. a i I a i a, h 1 a in a direction substantially radially relative; 5, In; a rapping n1aQhl Il8g l1 tVll 1g means Q to the shuttle the effect of the action of cenfor supporting an article to bte wrapped, the

tri'fugal force thereon will be reduced to a combination of a shuttle rotatable aroundmin mum.

I pp the article, aspoolirotatablyimounted ontheq What I claim is: shuttlefor supporting a Iroll of wrapping 1. Ina Wrapping machinehaving means vmaterialpa brake member pivotally ,cons lfor supporting article to be wrapped, the nectejd With theshuttle to extend in a direcw combination of a rotatably mounted spool ,tion substantially radiahthereto and engage for supporting a roll of wrapping material the spool, a counterbalanced lever pivotally I a brake member pivotallymountedat one end arranged on the shuttleto engage the enter a and arranged to engage the spool, adever' surface of therjoll, {11 d mea-nsfoi'cOlltrolling pivotally arranged to engage th outer s,ur-- the au tion of the brake. member lay-the posie .t face ofthe roll and having aprojectionqon tion; the lever, the positioniof the brake-1 the side engaging said'roll, a rodpivotally member and thelflvw counterbalance being mounted at the other end of the brakerlnemsuch that centrifugal forcedoes not substana ber and slidably carried bysaid projection,v qtially aflectitheoperetionwofthe-brake. 4 1

and a spring surrounding said rod and en- 6JIn a wrapping nlachine having means gaging said; projection to presssaid brake :for supporting an article to be wrappedythe i I a membe ag nst the sp l. combination of .a shuttle rotatable around 2, In {a Wrapping machine having means the article a spool rotatablymounted onzthei for supporting an article to be wrapped, the shuttle for supporting a roll of wrapping m i i n of a hut l otatable ar u d material, a brake memberfipivbtallyicon theparticle, a spool rotatably mounted on the" nected "with theshuttle to extend in avdirec; shuttle for supportinga roll, of Wrapping tion substantially radial thereto andyengage mater tal, and a brake mechanism mounted the spool; a counterbalanced leverpivotallya if on the shuttle for engagement with said arranged on the shuttle to engage the: outer spool and arranged so that the action of censurface of the roll and flninimize the effect I trif ugalforce has substantially no eti'ect on of centrifugal force in zthebrake:vmeinbergws i the operation of the brake mechanism. 1 and a spring arranged between the brake 3 In a- Wrapping machinehaying means member and the lever to exert'awcompressi-ve' for supporting an article to beiwrapped, the action controlling theaction of the brake 11 combination of a shuttle rotatable around member. i i

i the article,'a spool rotatably mounted on the In testimony whlereo f I afiiximy signature.

shuttle for supporting a roll of wrapping material, a brake mechanism mounted on the i a a j I 

